21222403123 has 8 divisors (see below), whose sum is σ = 21524757696. Its totient is φ = 20920363200.

The previous prime is 21222403099. The next prime is 21222403127. The reversal of 21222403123 is 32130422212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222403123 - 2⁵ = 21222403091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222403094 and 21222403103.

It is not an unprimeable number, because it can be changed into a prime (21222403127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58893 + ... + 214273.

It is an arithmetic number, because the mean of its divisors is an integer number (2690594712).

Almost surely, 2^21222403123 is an apocalyptic number.

21222403123 is a deficient number, since it is larger than the sum of its proper divisors (302354573).

21222403123 is a wasteful number, since it uses less digits than its factorization.

21222403123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157325.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21222403123 its reverse (32130422212), we get a palindrome (53352825335).

The spelling of 21222403123 in words is "twenty-one billion, two hundred twenty-two million, four hundred three thousand, one hundred twenty-three".